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Old 18th September 2020
Here for the gear

Thanks Kyle. The maximum air gap I can achieve is about 125mm. Any idea how I'd calculate the density of glass needed? Most of the secondary glazing units I've seen are around 7-12mm which I realise isn't particularly thick.

Basically wondering if I'm better off leaving double glazing as is or is there a marginal gain from adding secondary glazing. Obviously don't want to do it if it's going to be detrimental.

Just for info, the rest of the room is constructed as below:

Walls: Double layer of 15mm Acoustic plasterboard with Green Glue between on isolated wooden studs with 100mm insulation between the studs. There's then an air gap of about 50mm and then brick outer walls (9" thick). The ceiling is the same construction (2 layers of 15mm board+ GG, hanging from their own joists)